Prosecution Insights
Last updated: September 17, 2026
Application No. 18/550,562

BASE OIL COMPOSITION, FORMULATION AND USE

Final Rejection §102§103
Filed
Sep 14, 2023
Priority
Mar 15, 2021 — GB 2103523.3 +1 more
Examiner
OLADAPO, TAIWO
Art Unit
1771
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Equus UK Topco Ltd.
OA Round
5 (Final)
53%
Grant Probability
Moderate
6-7
OA Rounds
1m
Est. Remaining
65%
With Interview

Examiner Intelligence

Grants 53% of resolved cases
53%
Career Allowance Rate
620 granted / 1167 resolved
-11.9% vs TC avg
Moderate +12% lift
Without
With
+11.8%
Interview Lift
resolved cases with interview
Typical timeline
3y 1m
Avg Prosecution
60 currently pending
Career history
1248
Total Applications
across all art units

Statute-Specific Performance

§101
2.1%
-37.9% vs TC avg
§103
55.1%
+15.1% vs TC avg
§102
14.4%
-25.6% vs TC avg
§112
16.4%
-23.6% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1167 resolved cases

Office Action

§102 §103
DETAILED ACTION Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . The amendment dated 05/18/2026 has been considered and entered. The amendment requires the composition to be ISO 68 to ISO 168 which Tsubouchi (JP 2012-31359A) does not teach, thus overcoming the previous rejections in view of Tsubouchi now withdrawn. The response was considered but was not found to be persuasive over the rejections in view of Forbus (US 2017/0145336) which is hereby maintained. Claim Rejections - 35 USC § 102/103 The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention. The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. The factual inquiries for establishing a background for determining obviousness under 35 U.S.C. 103 are summarized as follows: 1. Determining the scope and contents of the prior art. 2. Ascertaining the differences between the prior art and the claims at issue. 3. Resolving the level of ordinary skill in the pertinent art. 4. Considering objective evidence present in the application indicating obviousness or nonobviousness. This application currently names joint inventors. In considering patentability of the claims the examiner presumes that the subject matter of the various claims was commonly owned as of the effective filing date of the claimed invention(s) absent any evidence to the contrary. Applicant is advised of the obligation under 37 CFR 1.56 to point out the inventor and effective filing dates of each claim that was not commonly owned as of the effective filing date of the later invention in order for the examiner to consider the applicability of 35 U.S.C. 102(b)(2)(C) for any potential 35 U.S.C. 102(a)(2) prior art against the later invention. Claims 37 – 46, 51 are rejected under 35 U.S.C. 102(a)(1) as anticipated by Forbus (US 2017/0145336) or, in the alternative, under 35 U.S.C. 103 as obvious over Forbus (US 2017/0145336) In regards to claim 37, Forbus teaches simple or complex carboxyl esters or mixtures comprising carboxyl end-capped-polytetramethylene glycols (abstract). Forbus teaches a lubricating fluid composition comprising diester of polytetramethylene glycol having a formula (1), wherein the groups R1 and R2 are linear alkyl groups having from 5 to 11 carbon atoms which are analogous to R of the claimed structure, and m is 2 to 4 and analogous m in the claimed structure, and the tetramethylene is a C4 linear alkylene which is analogous to X in the claimed structure, and thus provides the claimed base oil [0004]. Forbus teaches the use of the diester as base oil, and teaches that the R1 and R2 may each contain a branched group at less than 10%, or less than 5% [0018 – 0020]. The composition is suitable for providing the intended use limitation of the claim. Forbus teaches the composition having base oil blends with kinematic viscosity at 40℃ of from 15 to 1500 cSt which overlaps the claimed range [0023]. Even in the presence of optional additives the viscosity is majorly controlled by the oil in the absence of viscosity modifiers, or when they are used at minor amounts. The composition is useful as gear oil [0035]. In regards to claims 38 – 40, Forbus teaches the composition having the claimed limitation as previously discussed. In regards to claim 41, Forbus teaches the composition having the claimed limitation. The claim is drawn to a product by process step. So long as the ester compound is provided, the means of deriving the alkylene oxy group such as from bio or renewable resources used in forming the ester doesn’t carry patentable weight or is provided for in the ester compound itself. In regards to claim 42, Forbus teaches the composition having the compound with alkyl carbonyl having the claimed amounts of carbon atoms. In regards to claims 43 – 46, Forbus teaches the composition having the claimed limitation as previously stated. Product by process limitations is met when the product is taught. The means of providing the alkyl carbonyl groups from renewable or bio-based source does not carry patentable weight or is met as long as the final product is taught. In regards to claim 51, Forbus teaches the composition which can comprise one or more additive ingredients of the claims [0027]. The additives are present in amounts such that the amount of the base oil will meet or overlap the claimed ranges [0028 – 0034]. For instance, while rust inhibitors are present at 0 to 37%, pour point depressant at up to 10%, dispersant at up to 7% or metal detergent at up to 5%, the additives as a whole may be present at smaller amounts totaling from 1 to 30% or from 2 to 15% [0035]. Response to Arguments Applicant’s arguments have been considered but was not found to be persuasive. Applicant argues that Forbus is not directed to the electric vehicles of the claim. The argument is not persuasive. The claims are drawn to an oil formulation not to an electric engine apparatus. Forbus teaches the oil formulation of the claims and thus anticipates or obviates the claimed formulation. The formulation of Forbus will be expected to be suitable to perform the intended use limitation. Conclusion Applicant's amendment necessitated the new ground(s) of rejection presented in this Office action. Accordingly, THIS ACTION IS MADE FINAL. See MPEP § 706.07(a). Applicant is reminded of the extension of time policy as set forth in 37 CFR 1.136(a). A shortened statutory period for reply to this final action is set to expire THREE MONTHS from the mailing date of this action. In the event a first reply is filed within TWO MONTHS of the mailing date of this final action and the advisory action is not mailed until after the end of the THREE-MONTH shortened statutory period, then the shortened statutory period will expire on the date the advisory action is mailed, and any nonprovisional extension fee (37 CFR 1.17(a)) pursuant to 37 CFR 1.136(a) will be calculated from the mailing date of the advisory action. In no event, however, will the statutory period for reply expire later than SIX MONTHS from the mailing date of this final action. Any inquiry concerning this communication or earlier communications from the examiner should be directed to TAIWO OLADAPO whose telephone number is (571)270-3723. The examiner can normally be reached 8-5pm. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Prem Singh can be reached at 571-272-6381. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /TAIWO OLADAPO/Primary Examiner, Art Unit 1771
Read full office action

Prosecution Timeline

Show 4 earlier events
Mar 10, 2025
Response Filed
May 28, 2025
Final Rejection mailed — §102, §103
Aug 28, 2025
Response after Non-Final Action
Oct 28, 2025
Applicant Interview (Telephonic)
Oct 28, 2025
Examiner Interview Summary
Feb 18, 2026
Non-Final Rejection mailed — §102, §103
May 18, 2026
Response Filed
Jul 27, 2026
Final Rejection mailed — §102, §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12723213
LUBRICATING OIL COMPOSITIONS WITH IMPROVED OXIDATIVE PERFORMANCE COMPRISING ALKYLATED DIPHENYLAMINE ANTIOXIDANT AND CARBOXYLATE DETERGENTS
4y 0m to grant Granted Sep 01, 2026
Patent 12716001
Aromatic Organic Solvent Composition and Paint Composition Comprising the Same
3y 2m to grant Granted Aug 25, 2026
Patent 12692456
LUBRICANT COMPOSITION
3y 10m to grant Granted Jul 28, 2026
Patent 12692162
DISPERSIONS CONTAINING GRAPHENIC CARBON NANOPARTICLES AND DISPERSANT RESINS
1y 10m to grant Granted Jul 28, 2026
Patent 12686832
ASHLESS IONIC LIQUID
1y 7m to grant Granted Jul 21, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

6-7
Expected OA Rounds
53%
Grant Probability
65%
With Interview (+11.8%)
3y 1m (~1m remaining)
Median Time to Grant
High
PTA Risk
Based on 1167 resolved cases by this examiner. Grant probability derived from career allowance rate.

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